Abstract: A mobile computer as an electronic apparatus and a control method thereof. The control method of the mobile computer which receives power from an adaptor or a battery includes receiving power from one of the adaptor and the battery and operating in an adaptor mode or a battery mode, performing a predetermined power saving operation, which is disabled in the adapter mode, while operating in the battery mode, and performing the power saving operation in a battery emulation mode by maintaining power supply from the adaptor upon an occurrence of a predetermined mode changing event in the adaptor mode.

Abstract: A portable computer includes: a central processing unit; a connection chipset connected to the central processing unit and internally provided with a Universal Serial Bus (USB) controller, the connection chipset also having a plurality of ports allowing peripheral devices to be connected to the connection chipset; a Universal Serial Bus hub coupled to the connection chipset, the Universal Serial Bus hub having a plurality of connection ports allowing a plurality of devices to be connected to the Universal Serial Bus hub; and a switching circuit connected between the Universal Serial Bus hub and the Universal Serial Bus controller, the switching circuit serving to transmit an output signal from the Universal Serial Bus controller to the Universal Serial Bus hub when at least one of the devices connected to the Universal Serial Bus hub is driven.

Abstract: A portable computer includes a main body equipped with a main board with a CPU, and a power supply supplying electric power to the main board, the portable computer further including a wireless communicating part including an RF transmitting and receiving part provided at the main body, electrically connected to the main board, and wirelessly transmitting and receiving predetermined data using an RF signal, and an AD converter converting an analog signal received through the RF transmitting and receiving part into a digital signal and transmitting the digital signal to the CPU, and converting a digital signal from the CPU into an analog signal and transmitting the analog signal through the RF transmitting and receiving part.

Abstract: A battery pack and an electronic device using the same to output a plurality of power having a different voltage level each other. The battery pack includes: a power source including a plurality of battery cells, and outputting a plurality of battery powers of different voltage levels through combinations of the battery cells; and a plurality of power output terminals connectable to the electronic device and supplying the respective battery powers to the electronic device.

Abstract: A computer system equipped with a LAN signal processing part and a modem signal processing part comprises: a common connector to which an external LAN connector to be connected to the LAN signal processing part and an external modem connector to be connected to the modem signal processing part are selectively connected; a connector detector provided at the common connector for detecting which of the external LAN connector and the external modem connector is connected to the common connector; and a control part for controlling a predetermined signal to be transmitted to one of the LAN signal processing part and the modem signal processing part in correspondence to the external connector detected by the connector detector. With this configuration, the cost of production decreases, and space for an installation of hardware components is more plentiful.

Abstract: An electronic device has a microcomputer and a firmware thereof, a power switching part generating an on/off handling signal according to an external handling, and a power supply part supplying power to the electronic device according to the on/off handling signal. An updating system controls a signal cut-off part cutting off (blocking) the on/off handling signal of the power switching part while the microcomputer firmware is being updated by the updating system. An update failure of the microcomputer firmware because of a handling error of the power switch is prevented, because the on/off handling signal is blocked during the firmware updating.

Abstract: A portable computer includes a main body equipped with a main board with a CPU, and a power supply supplying electric power to the main board, the portable computer further including a wireless communicating part including an RF transmitting and receiving part provided at the main body, electrically connected to the main board, and wirelessly transmitting and receiving predetermined data using an RF signal, and an AD converter converting an analog signal received through the RF transmitting and receiving part into a digital signal and transmitting the digital signal to the CPU, and converting a digital signal from the CPU into an analog signal and transmitting the analog signal through the RF transmitting and receiving part.

Abstract: A computer system equipped with a LAN signal processing part and a modem signal processing part comprises: a common connector to which an external LAN connector to be connected to the LAN signal processing part and an external modem connector to be connected to the modem signal processing part are selectively connected; a connector detector provided at the common connector for detecting which of the external LAN connector and the external modem connector is connected to the common connector; and a control part for controlling a predetermined signal to be transmitted to one of the LAN signal processing part and the modem signal processing part in correspondence to the external connector detected by the connector detector. With this configuration, the cost of production decreases, and space for an installation of hardware components is more plentiful.

Abstract: Disclosed is a portable computer including a central processing unit, a connection chipset connected to the central processing unit and internally provided with a Universal Serial Bus (USB) controller, the connection chipset also having a plurality of ports allowing peripheral devices to be connected to the connection chipset, a Universal Serial Bus hub coupled to the connection chipset, the Universal Serial Bus hub having a plurality of connection ports allowing a plurality of devices to be connected to the Universal Serial Bus hub, and a switching circuit connected between the Universal Serial Bus hub and the Universal Serial Bus controller, the switching circuit serving to transmit an output signal from the Universal Serial Bus controller to the Universal Serial Bus hub when at least one of the devices connected to the Universal Serial Bus hub is driven.

Abstract: An apparatus and method for controlling power management enable a computer system to have minimum power consumption during a rest mode. The power management system in the computer system allows the contents of the main memory to be maintained when the system proceeds to the rest mode. The apparatus includes a microcontroller which receives a first operating voltage from the power supply and controls power distribution based on the power management program stored in a BIOS ROM. The microcontroller generates a control signal when the system proceeds to the rest mode.